Finding an alternative to infinite loop in Java

Question

I am doing my homework dedicated to the chat program. It has two interfaces: one for the server, the second for the client. The program flow is as follows:

• The server starts a connection on a specific port
• The client starts and tries to connect to the server
• If everything is ok, they start chatting
• One of the terminals of type "TERMINATE" will be completed.

This program was created from the book Deitel & Deitel Java How To Program 6e . The example has only two elements for each interface: displayArea (JTextArea) for displaying messages and input (JTextField) for entering messages.

Clicking Enterwill send the message to the other side.

The following is a snippet of Server.java code. It performs some repetitive actions in an infinite loop.

public void runServer() {
    // set up server to receive connections; process connections
    SwingUtilities.invokeLater(new Runnable() {

        public void run() 
        {
            try {

                // Step 1: Create a ServerSocket.
                String portNum = txtPort.getText();
                server = new ServerSocket(Integer.parseInt(portNum), 100);

                InetAddress ip = InetAddress.getLocalHost();
                txtServerIP.setText(ip.getHostAddress());

                while (true) {

                    try {
                        waitForConnection(); // Step 2: Wait for a connection.
                        getStreams(); // Step 3: Get input & output streams.
                        processConnection(); // Step 4: Process connection.
                    }
                    // process EOFException when client closes connection
                    catch (EOFException eofException) {
                        System.err.println("Client terminated the connection.");
                    }
                    finally {
                        closeConnection(); // Step 5: Close connection.
                        ++counter;
                    }
                } // end while
            } // end try
            // process problems with I/O
            catch (IOException ioException) {
                ioException.printStackTrace();
            }
        }
    });
} // end method runServer

It works well with source code. I decided to add some GUI interfaces to the interfaces and added the application window using Eclipse Luna 4.4.1. I added an input for the IP address and port number. Then I added the "Open Connection" button for the server GUI and another "Connect to Server" button for the client GUI.

Server.java, , " ". , . Client.java " " . Client , .

, Server - while ( true ). , , . , - .

?

public void runServer() {
    // set up server to receive connections; process connections
    SwingUtilities.invokeLater(new Runnable() {...

public void runServer() {
    // set up server to receive connections; process connections
    SwingUtilities.invokeLater(new Thread() {...

.

ServerGUI.java @http://pastebin.com/pVRi6EfC

ClientGUI.java @http://pastebin.com/HfftM159

:

Server.java @http://pastebin.com/6Q5Z00gb

Client.java @http://pastebin.com/uCGFGknf

Answer 1

, SwingUtilities.invokeLater. , invokeLater run Thread. Thread, .

Thread start , .

class MyChatServer extends Thread {
    public void run() {
        // the while loop
    }
}

Thread, " ", :

MyChatServer server = new MyChatServer();
server.start();

Thread Thread. Thread , . , (, while(true)), Thread, , ​​ .

, Thread, , .

Answer 2

- , . :

• -

, , .

, . , swing concurrency.